Can't tell you.
I'm not signing up to their site to read the article.
Unless there is a satisfaction guarantee.
So far this is what I have..
When you powerup the MiFi you go to http://my.jetpack from a laptop that's connected to the MiFi and you'll see under Settings | Advanced that you can update the settings shown here. When you do that you'll be able to connect to T-Mobile no problem. But getting your data usage levels and doing firmware updates? I don't see anything that will let you do that. I'm guessing those features are configured at the firmware layer and they're probably proprietary Verizon endpoints..